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    1. mihai, c., et al. "non-toxic metal-based catalysts for polyurethane synthesis: a review." green chemistry, 2021, 23(7): 2500¨C2516.
    2. haddleton, d. m., et al. "recent advances in sustainable catalysis for polyurethane production." acs sustainable chem. eng., 2020, 8(15): 5785¨C5796.
    3. european chemicals agency (echa), ¡°candidate list of substances of very high concern,¡± https://echa.europa.eu/candidate-list, 2023.

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